linux-kernel - Re: [PATCH 5.4 00/57] 5.4.70-rc1 review

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Date:   Tue, 06 Oct 2020 15:49:19 +0100
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     open list <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org,
        linux- stable <stable@...r.kernel.org>, pavel@...x.de,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 5.4 00/57] 5.4.70-rc1 review

On Tue, 2020-10-06 at 13:55 +0530, Naresh Kamboju wrote:
[...]
> NOTE:
> While running LTP containers test suite,
> I noticed this kernel panic on arm64 Juno-r2 devices.
> Not easily reproducible and not seen on any other arm64 devices.
> 
> steps to reproduce:
> ---------------------------
> # boot stable rc 5.4.70 kernel on juno-r2 machine
> # cd /opt/ltp
> # ./runltp -f containers
> 
> Crash log,
> ---------------
> pidns13     0  TINFO  :  cinit2: writing some data in pipe
> pidns13     0  TINFO  :  cinit1: setup handler for async I/O on pipe
> pidns13     1  TPASS  :  cinit1: si_fd is 6, si_code is 1
> [  122.275627] Internal error: synchronous external abort: 96000210
> [#1] PREEMPT SMP
[...]
> [  122.399545] Call trace:
> [  122.401995]  sil24_interrupt+0x28/0x5f0
[...]
> [  122.467321] Code: d503201f f9400ac0 f9400014 91011294 (b9400294)
[...]

This corresponds to the statement:

        status = readl(host_base + HOST_IRQ_STAT);

So it looks like the PCI device stopped responding to MMIO for some
reason.  It could be faulty hardware.  I don't see any sign of run-time 
power management in that driver that might explain it.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom